<?php /** * Calc shift length in format 12:23h. * @param Shift $shift */ function shift_length($shift) { $length = floor(($shift['end'] - $shift['start']) / (60 * 60)) . ":"; $length .= str_pad((($shift['end'] - $shift['start']) % (60 * 60)) / 60, 2, "0", STR_PAD_LEFT) . "h"; return $length; } ?>